Oven-thermometer.



A. E. WHITTIER.

OVEN THERMOMETEL APPLICATION FILED 0019,1908.

91 7,39 1 Patented Apr. 6, .1909.

hurrah srarns i gran te @FMGE ALBERT E. WHITTIER, OF BRISTOL CONNECTICUT.

OVENPTHEBKVIOWTER.

Specification of Letters Patent.

Patented .tpitil-d, MQQQ.

Application filed October 9, 1908. Serial No. QSGAFEO.

f1. all whom may concern:

it known that l, ALBERT E. NEITHER, citizen of the United States, residing at Bristol, in the county of Hartford and State of Connecticut, have invented a new and useful Uven-Thermometer, of which the following i sa'specification f This invention relates to those devices which are designed to be attached to the Walls of ovens of wood, coal, gas, oil an electric stoves and ranges for the purpose of indicating the temperature of the atmosphere in the interior so that baking, roasting and other cooking may be done with certainty and exactness, and with a saving of time and fuel.

or base and the thermometricmechanism.

Fig. shows a rear view of the base. Fig. 6 is a detail on larger scale, showing the hand s indle, the stop blockcarried by the spin- 'e, the end of the thermonietric arm and block. he casing of this device, which is desirably formed of cast malleable iron, that is sto cheap, strong and porous for heat, has an an nular body 1 with a flange 2 extending outwardly from its rear edge and ears 3 that project from the flange and are provided with perforations '4 for the passage of the screws, belts or rivets, by means of which the device is fastened in an opening in the wall or door of the oven of a stove, range or other baking chamber.

The rear of the cas ng is rabbeted and iitting therein is the back plate or base 5 which is provided with perforations for receiving the lugs 6, which are preferably cast inie 'ral with the casing and, when the parts are assembled, are headed over on the outside of the base. The base has a recess opening to the rear and this provides a forwardly extending hub 7. Secured to an ear 8, that is preferably cast integral with the base, by'

rivets or otherwise, is the end of a bi-Inetallic the link vwhich connects the arin with the thermometric arm 9. thermometric arm which is formed as usual of two stri s of metal "having different ,co-ellicients 0 exsteel, tightly fastened together, is curved around the hub, The free end of the therrnometric arm is hinged to a short link which is hinged to the outer end of a block 11 that is mounted on and secured to the s indle 12 which has a bearin'gback of the b ook in the base and is supported in front 14 :of this block is arranged to engage With the sides of the brid e and form a stop for positively limiting t e movements of the lock and the spindle when they are turned thermometric arm.

Fastened by screws or otherwise to the. 'front face of the hub that projects forwardly from the base is a dial 15, stamped or otherwise marked upon which, in the arc of a cirole, is a scale, preferably provided with the dicating various degrees of tem erature. The spindle which bears the stop b ock that is'connected with the therinometric arm extends throu h a perforation near the lower edge of the .ial, and mounted on the spindle dicatcs the various degrees-o1 tem eraturo when the device is in use. lt-lspre 'erred to insert a trimming band 17 of brass or other place a glass cover over the band and hold it in place by a flanged ring 18 for protecting the dial and hand.

This device has very few operating parts and these parts are-exceedingly simp e to manufacture and assemble. Thecasin and cast mal eable iron so that they are strong and yet they are porous and very good conv ductors of heat. The recess on the inside of the base forms a chamber into which the heated air of the oven circulates in such mannor that the heat is absorbed by the base and conducted to the thermometric arm and not reflected, as it is with a base formed with a smooth flat surface of rolled or stamped sheet metal. The hub provided by the recess in the base projects well into the interior and the thermomctric arm is curved around the hub in such manner that heat is rapidly inside strip of the bi-metailic thermometr'ic pension when heated, such as copper and numerals from 1 to 12, and also numerals inis a hand 16 which points to the scale and in metal in the outer end of the casing, and j base are referably formed, as stated, oi thin of the block by a bridgelS. The inner end A by the expansion and contraction of. the

l l J and quickly radiated from theside wall to th v arm, and this, practice has demonstrated,

has resulted in providing a thermometer which is exceedingly accurate and sensitive, both when the temperature is'rising and falling in the oven ofthe-stove or' range to which the device is applied.

The invention claimedis'z 1. An oven thermometer having acasing, a reentrant base attached to the casing, a

dial bearing a scale, attached to the base, a curved bi-metal thermometric' arm within the casing, a spindle extending through the lower edge of the dial, a block secured to the spindle, a link connecting the thermometric arm and the block, and a hand mounted on the spindle and pointing toward the scale, substantially as specified. 2. An oven thermometer having a casing, a base attached to the casing, a hollow hub projecting from the base into the. casing, a thermometric arm secured to the base and encircling the hub, a spindle, a block carried by the spindle, a link connecting said block and the thermometric arm, a dial bearing. a scale, said spindle. extendin through the lower edge of the dial, and a hand mounted on the spindle and pointing to the scale, substantially as specified. i

3. An oven thermometer. having a recessed base open at the back, a thermometric arm encircling the recessed part of the base, a spindle, a block carried by the spindle, a link connecting said block and the thermometric arm, a dial bearing a scale, 'said'spindle extendm through the lower edge of the dial, and a and mounted on the spindle and pointing to the scale, substantially as specified.

- 4. An oven thermometer having a base, a hollow hub projecting forwardly from the base, a thermometric arm encircling the hub, a spindle, a. block carried by the spindle, a

link connecting said block and the thermometric arm, va-dial bearing a scale, and a hand .mounted on the spindle and pointing to the scale, substantially as specified.

5.- An oven thermometer having a base, a thermometric arm attached to the base, a spindle, a block carried by the spindle, a link connecting said block and the thermometric arm, a diallbearing a scale, said s indle extending through the lower edge or the dial, and a hand mounted on the spindle and pointing to the scale, substantially as specihed.

6. An oven thermometer having a base," a

-thermometric -armsecured to the base, a

bridge attached to the base, a spindle mountedon the base and supported by said bridge, a block carried by said spindle and-adapted to limit its movement, a link connecting said block andthe thermometric arm, adial bearing a scale, and a hand mounted on the spindle andkpointing to the scale, substantially as specifie 7. An oven thermometer having an annular casing with supporting ears, a base secured to the rear of said casing, a curved thermometric arm secured to the base, a spindle mounted on the base, a block carried by said s indle, a link connecting said block and the t ermometric arm,'a dial bearing a ALBERT E. GooDwIN M. A: HonG'noN.

ointing to the scale, substantially as 

